Your choices are -
Firestone Ride-Rite: 2070 - Front Kit, Kit Number: W217602070
Air Lift LoadLifter 5000 Air Helper Springs - Front Axle Item # AL57140
You also have -
SumoSprings Rebel Custom Helper Springs - 2 Piece - Front Axle Item # SSF-172-40-2
Or if you are not budget limited - https://kelderman.com/shop/ford-f-53...air-suspension
I have Firestone on all four corners on my coach.